Free Poisson fields and their automorphisms

Details Free Poisson fields and their automorphisms Free Poisson fields and their automorphisms

2012-02-20

arxiv.org/abs/1202.4382v1

Mathematics

Rings and Algebras

11 pages. arXiv admin note: text overlap with arXiv:1102.0366

Scientific paper

Let $k$ be an arbitrary field of characteristic 0. We prove that the group of automorphisms of a free Poisson field $P(x,y)$ in two variables $x,y$ over $k$ is isomorphic to the Cremona group $\mathrm{Cr}_2(k)$. We also prove that the universal enveloping algebra $P(x_1,...,x_n)^e$ of a free Poisson field $P(x_1,...,x_n)$ is a free ideal ring and give a characterization of the Poisson dependence of two elements of $P(x_1,...,x_n)$ via universal derivatives.

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